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7 terms
Photonics Dictionary: R
Clear All Filters x
objectives x
R x
Rayleigh criterion of resolving power
When a lens system with a circular aperture is free of aberrations, the image of a point object will appear as a disc of finite size surrounded by concentric rings. When two points are separated such...
reflecting microscope
A microscope that uses a reflecting objective; often used with ultraviolet or infrared radiation.
reflecting objective
An image-forming system that uses mirrors rather than lenses. Such objectives are frequently used for astronomical telescopes and in ultraviolet microscopes.
reflecting telescope
A telescope that uses a reflecting objective to focus an image of a distant object at a focal point.
retrofocus lens
Also known as reversed telephoto lens. A lens consisting of an ordinary objective with a negative component near its front focal point. Thus, the back focus is large, relative to its focal length....
reversed telephoto lens
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retrofocus lens
Also known as reversed telephoto lens. A lens consisting of an ordinary objective with a negative component near its front focal point. Thus, the back focus is large, relative to its focal length....
ringlight
A circular lamp or bundles of optical fibers placed around the perimeter of an objective lens to illuminate the object field below it.
Photonics Dictionary
R
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